This section applies where a section 33 consent ("the original consent") has been granted or made as a result of an application made before Part 4 came into force.
Nothing in section 33 prevents the original consent, or a section 33 consent that replaces it, from being varied or replaced.
If the original consent, or a section 33 consent that replaces it, is varied or replaced, section 31 does not apply to the development to which the consent as varied, or the replacement consent, relates (and so development consent is not required for that development).
A section 33 consent replaces an earlier section 33 consent for the purposes of this section if (but only if)—
In this section " section 33 consent " means a consent, authorisation, order, notice or scheme mentioned in section 33(1), (2) or (4).